Distribution Characteristics of Pathogens in Different Stages of Pressure Ulcers and the Therapeutic Effect of Linear Polarized Polychromatic Light Combined with Silver Sulfadiazine Cream

To investigate the distribution characteristics of pathogens in different stages of pressure ulcers and observe the application of linear polarized polychromatic light (LPPL) combined with silver sulfadiazine cream in treating varying stages of pressure ulcers. This study comprised 88 patients with pressure ulcers who were enrolled in the department of burn and plastic surgery of our hospital from April 2019 to April 2022. The wound exudates from patients were collected, followed by analyzing the distribution of pathogens in different stages of pressure ulcers. Patients were randomly divided into 2 groups. The first group (n=44) received LPPL combined with silver sulfadiazine. The other group was intervened with LPPL group only for 2 weeks. The clinical efficacy, condition, and pain in the 2 groups, as well as the healing timeframes for patients were measured at different stages. The findings showed that among 88 patients with pressure ulcers, 62 were infected, and the infection rate was 70.45%. The pathogens that were observed in stage II and III to IV pressure ulcers were mainly Gram-negative bacteria. The total effective rate in the combined group was 90.91%, which was much higher than that of LPPL group (70.45%). Compared with LPPL group, the pressure ulcer scale for healing and visual analogue scale scores in the combined group were markedly lower (P<.05). It is important to note that in LPPL group, the healing time of patients in stage II and stage III to IV in the combined arm were 9.76 +/- 2.38 days and 13.19 +/- 2.54 days, respectively. The corresponding time in the LPPL group was prolonged to 13.20 +/- 3.76 and 18.82 +/- 4.17 days, respectively. The main pathogens associated with wound infection in patients with pressure ulcers are Gram-negative bacteria. The curative effects of LPPL combined with sulfadiazine silver cream on patients with pressure ulcer is obviously improved, and the recovery and pain relief are faster while the healing time of pressure ulcer is shorter.